The free family event offers a live rain garden demonstration by Hui o Ko‘olaupoko, surgeonfish feeding, educational booths and native Hawaiian plants giveaway by the Hawaiian Electric Co.Hui O Ko‘olaupoko will be unveiling a 150-square-foot rain garden designed to capture roof runoff from the Diamond Head side of the main building and infiltrate water into an area vegetated with natural plants.

This year's expo focuses on our impact on water sources — from mauka to makai.

Enjoy keiki arts and crafts, along with educational exhibits. Free parking and shuttles available at Waikiki Elementary School beginning at 8:45 a.m. Admission is free.

Afterwards, enjoy a free festival from noon to 3 p.m. with food vendors, educational booths, keiki activities and prize giveaways. Enjoy live music from the Late Ones and Dread Ashanti. Free T-shirts for the first 1,000 volunteers provided by sponsors Hurley and Hawaiian Electric. All are welcome.

On Earth Day, April 22, join the Surfrider Foundation 9 a.m. at Maui County Council chambers to show your support for Bill 24, which would ban smoking products on Maui County beaches and parks. An Earth Day event will follow. Visit maui.surfrider.orgto learn more. Or join the Blue Planet Foundation and Hawaii's youth at the state Capitol on Oahu from 10 a.m. to noon for a clean energy rally.